The Ultimate3S QRSS/WSPR Transmitter Kit is the new edition of the third version in the "Ultimate" QRSS/WSPR kit trilogy. It can produce QRSS, Hell, WSPR, Opera and PI4 slow-signal modes anywhere from 2200m to 2m bands. Plug-in LPF filters are available for all 13 HF/MF/LF bands from 2200m to 6m.

The Ultimate3S QRSS/WSPR transmitter kit includes an Si5351A synthesiser module kit and plug-in low pass filter modules which are also available separately for bands from 2200m to 6m. The kit can transmit on any frequency from the amateur 2200m (137kHz) to 2m (145MHz) bands. Changing bands is a matter of plugging in the appropriate low pass filter kit to attenuate unwanted harmonic output. The relay-switched LPF kit may be used to automatically switch between up to 6 different bands.

Instructions

Printed instructions are not supplied with the kit! You need to download them here. You need FOUR manuals, and to choose the version appropriate to your PCB and firmware version: the Assembly manual, the Operating manual, the Si5351A manual and the Low Pass Filter kit manual.

Many thanks Toru JG1EIQ for the Japanese translation. Toru also translated the v3.07 operating manual available from the firmware page.

The kit contains the PCB, back-lit blue LCD, programmed microcontroller and all board-mounted components. It also includes the separate Si5351A synth kit and a LPF kit for one band of your choice. Download the instruction manuals using the link above. The PCB is quite compact and care is required in the construction. A rich array of functionality is provided by the design; please read the instruction manuals to understand the facilities provided. Builder modifications will be shown on this page as they are developed!

Dimensions: the LCD module is 80mm x 36mm. The main board is 80 x 37mm.

Kit photos (click for larger versions):

More photos...

These photos show a working U3, complete with attached relay-switched Low Pass Filter board, available for GBP 9. The relay-switched LPF board can have up to five additional LPF's plugged in, permitting the U3 to sequence between 6 bands (including the LPF on the main U3 board). Note that my photos show NO additional LPF's plugged in (as I only have one built LPF here right now).